GB755893A - Top table with a rotary plate, especially for use in machine tools - Google Patents

Abstract

755,893. Dividing-engines. DIXI, SOC. ANON. June 22, 1954 [July 2, 1953], No. 18239/54. Class 97 (3). [Also in Group XXII] A top table 16, Fig. 1, e.g. for dividing and indexing machines, comprises a plate 18 rotatable on a housing 17 which may be set up on the machine slide 7 with the plate either parallel with or perpendicular to the surface of the slide, the housing having an extension 23, Fig. 5, providing a large contact area on the slide when the table is arranged perpendicularly, and cutting across the plane of contact between the housing and slide when the table is arranged parallel to the slide. The plate is clamped to the housing by a number of bolts 41 engaging by their heads 43 a ring 45 on the table and being urged against the ring by springs 47. The plate is released by turning a disc 51 by a handle 57 connected to a projection on the disc by lever 59 and link 58. A lever 48 pivoted beneath each bolt has a bearing 50 running on the disc and engaging a depression 52 to effect clamping. On turning the disc the bearings move out of the depressions thus raising the levers and bolts. Coarse adjustment of the plate is effected manually with the aid of scale 21, and fine adjustment is made by hand wheel 62, Fig. 8, driving the plate via worm 63, worm wheel 64 and pinions 67, 69, a scale being provided on ring 60 and viewed through a microscope 61. Alternatively the scale may be projected on to a screen. Pinion 67 and worm wheel 64 are loose on a bolt 65 urged downwardly to clutch them together frictionally by a spring 70. The end of the bolt cooperates with a lug 73 on disc 51 which may be positioned to free both the plate and parts 64, 67 for coarse adjustment of the plate. In a second position, the plate remains free but parts 64, 67 are clutched together for fine adjustment of the plate. In its final position, the plate is clamped. In a modification worm wheel 64 is keyed to the bolt and dogs are provided on pinion 67 and bolt head 74. Specification 755,894 is referred to.